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Finding the Fourth Proportional to 260,054.90, 390,082.35 and 212,815.70

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Solution

The fourth proportional to 260,054.90, 390,082.35 and 212,815.70 is: 319,223.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,054.90 : 390,082.35 = 212,815.70 : x
  2. Step 2: Convert to fraction form
    260,054.90/390,082.35 = 212,815.70/x
  3. Step 3: Cross multiply
    260,054.90x = 390,082.35 × 212,815.70
  4. Step 4: Simplify right side
    260,054.90x = 83,015,648,372.90
  5. Step 5: Solve for x
    x = 83,015,648,372.90/260,054.90
  6. Step 6: Final answer
    x = 319,223.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.